/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.beam.runners.core;

import org.apache.beam.runners.core.TimerInternals.TimerData;
import org.apache.beam.sdk.values.WindowedValue;

/**
 * Interface that contains all the timers and elements associated with a specific work item.
 *
 * @param <K> the key type
 * @param <ElemT> the element type
 */
public interface KeyedWorkItem<K, ElemT> {
  /** Returns the key. */
  K key();

  /** Returns an iterable containing the timers. */
  Iterable<TimerData> timersIterable();

  /** Returns an iterable containing the elements. */
  Iterable<WindowedValue<ElemT>> elementsIterable();
}
